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Sony VFET Amplifier Part 2
Sony VFET Amplifier Part 2
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Old 12th February 2018, 04:56 PM   #3501
luvdunhill is online now luvdunhill  United States
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Quote:
Originally Posted by R-K Rønningstad View Post
Me too
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Originally Posted by dsdjoy View Post
I am also in interested in a pair of 3 output PCB. Thanks.
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Originally Posted by Msr Mojo View Post
I'd be interested in a pair.
Please PM me (yours is full).
Thanks.

M
I think the next steps are for me to build and verify the CSX2 version of the board (different input scheme, and different PSU / bias scheme).

If anyone would be interested in prototyping a board, I would be willing to send you an OS and one or both of the FE boards, for free. Most of the decisions that need to be made around more mechanical and physical layout, more than electrical.
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Old 13th February 2018, 03:31 PM   #3502
brandanbooth is offline brandanbooth  United States
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Default Issues with channel one of amp

i biased everything up and all looked good 1.5 on both and vfet at +11 and -10.1 50 mv on out i installed the vfets and powered up the amp and i am only getting 6.8mV to 7.0mV from t1 to -v and the amp is not getting warm. any ideas on what this could be?
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Old 13th February 2018, 03:52 PM   #3503
Telstar is offline Telstar  Italy
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Quote:
Originally Posted by luvdunhill View Post
I think the next steps are for me to build and verify the CSX2 version of the board (different input scheme, and different PSU / bias scheme).
What is different in that version?
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Old 13th February 2018, 04:39 PM   #3504
luvdunhill is online now luvdunhill  United States
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Quote:
Originally Posted by Telstar View Post
What is different in that version?

The output stage board I designed can implement the CSX2 schematic as called out, by setting some jumpers and changing a few components . I just want to make sure it actually works, as to date I have only built the VFET2 OS.
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Old 13th February 2018, 04:40 PM   #3505
Telstar is offline Telstar  Italy
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Originally Posted by luvdunhill View Post
The output stage board I designed can implement the CSX2 schematic as called out
Can you link it?
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Old 13th February 2018, 05:29 PM   #3506
dsdjoy is offline dsdjoy  Germany
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I finished my build.
VFET2.jpg

I am very impressed with the sound of this amp. One of the best I've heard since quite some time. Hard to describe it.

- Very quiet background, as if it has less 'noise' than other amps, let's me listen "deeper" into the music.
- Very detailed, without being exhausting/nerving, and at the same time fluid, relaxed.
- Music, esp. voices have presence,shimmer,brilliance (something which I heard also from a J2 before.)

In short: The perfect amp for me. Now I am considering to build a 2 or 3 output version.
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Old 13th February 2018, 07:38 PM   #3507
atmasphere is offline atmasphere  United States
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Has anyone hear heard of SITs from Cree?
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Old 13th February 2018, 08:08 PM   #3508
vvs07 is offline vvs07  United States
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Sony VFET Amplifier Part 2
Quote:
Originally Posted by dsdjoy View Post
I finished my build.
Attachment 662273

I am very impressed with the sound of this amp. One of the best I've heard since quite some time. Hard to describe it.

- Very quiet background, as if it has less 'noise' than other amps, let's me listen "deeper" into the music.
- Very detailed, without being exhausting/nerving, and at the same time fluid, relaxed.
- Music, esp. voices have presence,shimmer,brilliance (something which I heard also from a J2 before.)

In short: The perfect amp for me. Now I am considering to build a 2 or 3 output version.
What is the power supply board used in your amp and where can one get it?
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Old 13th February 2018, 10:12 PM   #3509
brandanbooth is offline brandanbooth  United States
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Quote:
Originally Posted by brandanbooth View Post
i biased everything up and all looked good 1.5 on both and vfet at +11 and -10.1 50 mv on out i installed the vfets and powered up the amp and i am only getting 6.8mV to 7.0mV from t1 to -v and the amp is not getting warm. any ideas on what this could be?
Voltages are as follows
G-t6 +30.1; g-t4- .35; t6-t7 +1.35; t6-t11 10.54; g-t18 .93; g-t14 +14.66; g-t19+8.06; g-t17 -9.27;g-t8 -30.06;g-t2 +.56; t8-t9 1.37; t8-t13 -10.15;g-t15 -14.64;g-t20-11.43;g-t16 +6.63
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Old 14th February 2018, 05:39 PM   #3510
dsdjoy is offline dsdjoy  Germany
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Quote:
Originally Posted by vvs07 View Post
What is the power supply board used in your amp and where can one get it?
It is a FirstWatt supply inspired, selfmade PCB design. It was a small series of 3 boards for my own use. Functionalitywise it's the same as the Universal PSU board in the diyaudio store. Main addition is the Temperature-circuit-breaker.

However I believe this circuit breaker won't save the VFETs. If the amp is getting way too hot, the VFETs might be gone already.
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